LXR linux/arch/m68k/atari/debug.c

   1/*
   2 * linux/arch/m68k/atari/debug.c
   3 *
   4 * Atari debugging and serial console stuff
   5 *
   6 * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
   7 *
   8 * This file is subject to the terms and conditions of the GNU General Public
   9 * License.  See the file COPYING in the main directory of this archive
  10 * for more details.
  11 */
  12
  13#include <linux/types.h>
  14#include <linux/tty.h>
  15#include <linux/console.h>
  16#include <linux/init.h>
  17#include <linux/delay.h>
  18
  19#include <asm/atarihw.h>
  20#include <asm/atariints.h>
  21
  22/* Flag that Modem1 port is already initialized and used */
  23int atari_MFP_init_done;
  24/* Flag that Modem1 port is already initialized and used */
  25int atari_SCC_init_done;
  26/* Can be set somewhere, if a SCC master reset has already be done and should
  27 * not be repeated; used by kgdb */
  28int atari_SCC_reset_done;
  29
  30static struct console atari_console_driver = {
  31        .name   = "debug",
  32        .flags  = CON_PRINTBUFFER,
  33        .index  = -1,
  34};
  35
  36
  37static inline void ata_mfp_out(char c)
  38{
  39        while (!(mfp.trn_stat & 0x80))  /* wait for tx buf empty */
  40                barrier();
  41        mfp.usart_dta = c;
  42}
  43
  44void atari_mfp_console_write(struct console *co, const char *str,
  45                             unsigned int count)
  46{
  47        while (count--) {
  48                if (*str == '\n')
  49                        ata_mfp_out('\r');
  50                ata_mfp_out(*str++);
  51        }
  52}
  53
  54static inline void ata_scc_out(char c)
  55{
  56        do {
  57                MFPDELAY();
  58        } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
  59        MFPDELAY();
  60        scc.cha_b_data = c;
  61}
  62
  63void atari_scc_console_write(struct console *co, const char *str,
  64                             unsigned int count)
  65{
  66        while (count--) {
  67                if (*str == '\n')
  68                        ata_scc_out('\r');
  69                ata_scc_out(*str++);
  70        }
  71}
  72
  73static inline void ata_midi_out(char c)
  74{
  75        while (!(acia.mid_ctrl & ACIA_TDRE))    /* wait for tx buf empty */
  76                barrier();
  77        acia.mid_data = c;
  78}
  79
  80void atari_midi_console_write(struct console *co, const char *str,
  81                              unsigned int count)
  82{
  83        while (count--) {
  84                if (*str == '\n')
  85                        ata_midi_out('\r');
  86                ata_midi_out(*str++);
  87        }
  88}
  89
  90static int ata_par_out(char c)
  91{
  92        unsigned char tmp;
  93        /* This a some-seconds timeout in case no printer is connected */
  94        unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ;
  95
  96        while ((mfp.par_dt_reg & 1) && --i) /* wait for BUSY == L */
  97                ;
  98        if (!i)
  99                return 0;
 100
 101        sound_ym.rd_data_reg_sel = 15;  /* select port B */
 102        sound_ym.wd_data = c;           /* put char onto port */
 103        sound_ym.rd_data_reg_sel = 14;  /* select port A */
 104        tmp = sound_ym.rd_data_reg_sel;
 105        sound_ym.wd_data = tmp & ~0x20; /* set strobe L */
 106        MFPDELAY();                     /* wait a bit */
 107        sound_ym.wd_data = tmp | 0x20;  /* set strobe H */
 108        return 1;
 109}
 110
 111static void atari_par_console_write(struct console *co, const char *str,
 112                                    unsigned int count)
 113{
 114        static int printer_present = 1;
 115
 116        if (!printer_present)
 117                return;
 118
 119        while (count--) {
 120                if (*str == '\n') {
 121                        if (!ata_par_out('\r')) {
 122                                printer_present = 0;
 123                                return;
 124                        }
 125                }
 126                if (!ata_par_out(*str++)) {
 127                        printer_present = 0;
 128                        return;
 129                }
 130        }
 131}
 132
 133#ifdef CONFIG_SERIAL_CONSOLE
 134int atari_mfp_console_wait_key(struct console *co)
 135{
 136        while (!(mfp.rcv_stat & 0x80))  /* wait for rx buf filled */
 137                barrier();
 138        return mfp.usart_dta;
 139}
 140
 141int atari_scc_console_wait_key(struct console *co)
 142{
 143        do {
 144                MFPDELAY();
 145        } while (!(scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
 146        MFPDELAY();
 147        return scc.cha_b_data;
 148}
 149
 150int atari_midi_console_wait_key(struct console *co)
 151{
 152        while (!(acia.mid_ctrl & ACIA_RDRF)) /* wait for rx buf filled */
 153                barrier();
 154        return acia.mid_data;
 155}
 156#endif
 157
 158/*
 159 * The following two functions do a quick'n'dirty initialization of the MFP or
 160 * SCC serial ports. They're used by the debugging interface, kgdb, and the
 161 * serial console code.
 162 */
 163#ifndef CONFIG_SERIAL_CONSOLE
 164static void __init atari_init_mfp_port(int cflag)
 165#else
 166void atari_init_mfp_port(int cflag)
 167#endif
 168{
 169        /*
 170         * timer values for 1200...115200 bps; > 38400 select 110, 134, or 150
 171         * bps, resp., and work only correct if there's a RSVE or RSSPEED
 172         */
 173        static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };
 174        int baud = cflag & CBAUD;
 175        int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;
 176        int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00;
 177
 178        if (cflag & CBAUDEX)
 179                baud += B38400;
 180        if (baud < B1200 || baud > B38400+2)
 181                baud = B9600;           /* use default 9600bps for non-implemented rates */
 182        baud -= B1200;                  /* baud_table[] starts at 1200bps */
 183
 184        mfp.trn_stat &= ~0x01;          /* disable TX */
 185        mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
 186        mfp.tim_ct_cd &= 0x70;          /* stop timer D */
 187        mfp.tim_dt_d = baud_table[baud];
 188        mfp.tim_ct_cd |= 0x01;          /* start timer D, 1:4 */
 189        mfp.trn_stat |= 0x01;           /* enable TX */
 190
 191        atari_MFP_init_done = 1;
 192}
 193
 194#define SCC_WRITE(reg, val)                             \
 195        do {                                            \
 196                scc.cha_b_ctrl = (reg);                 \
 197                MFPDELAY();                             \
 198                scc.cha_b_ctrl = (val);                 \
 199                MFPDELAY();                             \
 200        } while (0)
 201
 202/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
 203 * delay of ~ 60us. */
 204#define LONG_DELAY()                                    \
 205        do {                                            \
 206                int i;                                  \
 207                for (i = 100; i > 0; --i)               \
 208                        MFPDELAY();                     \
 209        } while (0)
 210
 211#ifndef CONFIG_SERIAL_CONSOLE
 212static void __init atari_init_scc_port(int cflag)
 213#else
 214void atari_init_scc_port(int cflag)
 215#endif
 216{
 217        extern int atari_SCC_reset_done;
 218        static int clksrc_table[9] =
 219                /* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
 220                { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
 221        static int brgsrc_table[9] =
 222                /* reg 14: 0 = RTxC, 2 = PCLK */
 223                { 2, 2, 2, 2, 2, 2, 0, 2, 2 };
 224        static int clkmode_table[9] =
 225                /* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
 226                { 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
 227        static int div_table[9] =
 228                /* reg12 (BRG low) */
 229                { 208, 138, 103, 50, 24, 11, 1, 0, 0 };
 230
 231        int baud = cflag & CBAUD;
 232        int clksrc, clkmode, div, reg3, reg5;
 233
 234        if (cflag & CBAUDEX)
 235                baud += B38400;
 236        if (baud < B1200 || baud > B38400+2)
 237                baud = B9600;           /* use default 9600bps for non-implemented rates */
 238        baud -= B1200;                  /* tables starts at 1200bps */
 239
 240        clksrc  = clksrc_table[baud];
 241        clkmode = clkmode_table[baud];
 242        div     = div_table[baud];
 243        if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {
 244                /* special treatment for TT, where rates >= 38400 are done via TRxC */
 245                clksrc = 0x28;          /* TRxC */
 246                clkmode = baud == 6 ? 0xc0 :
 247                          baud == 7 ? 0x80 : /* really 76800bps */
 248                                      0x40;  /* really 153600bps */
 249                div = 0;
 250        }
 251
 252        reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
 253        reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
 254
 255        (void)scc.cha_b_ctrl;           /* reset reg pointer */
 256        SCC_WRITE(9, 0xc0);             /* reset */
 257        LONG_DELAY();                   /* extra delay after WR9 access */
 258        SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03)
 259                                      : 0 | 0x04 /* 1 stopbit */ | clkmode);
 260        SCC_WRITE(3, reg3);
 261        SCC_WRITE(5, reg5);
 262        SCC_WRITE(9, 0);                /* no interrupts */
 263        LONG_DELAY();                   /* extra delay after WR9 access */
 264        SCC_WRITE(10, 0);               /* NRZ mode */
 265        SCC_WRITE(11, clksrc);          /* main clock source */
 266        SCC_WRITE(12, div);             /* BRG value */
 267        SCC_WRITE(13, 0);               /* BRG high byte */
 268        SCC_WRITE(14, brgsrc_table[baud]);
 269        SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0));
 270        SCC_WRITE(3, reg3 | 1);
 271        SCC_WRITE(5, reg5 | 8);
 272
 273        atari_SCC_reset_done = 1;
 274        atari_SCC_init_done = 1;
 275}
 276
 277#ifndef CONFIG_SERIAL_CONSOLE
 278static void __init atari_init_midi_port(int cflag)
 279#else
 280void atari_init_midi_port(int cflag)
 281#endif
 282{
 283        int baud = cflag & CBAUD;
 284        int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;
 285        /* warning 7N1 isn't possible! (instead 7O2 is used...) */
 286        int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;
 287        int div;
 288
 289        /* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
 290         * default) the standard MIDI speed 31250. */
 291        if (cflag & CBAUDEX)
 292                baud += B38400;
 293        if (baud == B4800)
 294                div = ACIA_DIV64;       /* really 7812.5 bps */
 295        else if (baud == B38400+2 /* 115200 */)
 296                div = ACIA_DIV1;        /* really 500 kbps (does that work??) */
 297        else
 298                div = ACIA_DIV16;       /* 31250 bps, standard for MIDI */
 299
 300        /* RTS low, ints disabled */
 301        acia.mid_ctrl = div | csize | parity |
 302                    ((atari_switches & ATARI_SWITCH_MIDI) ?
 303                     ACIA_RHTID : ACIA_RLTID);
 304}
 305
 306static int __init atari_debug_setup(char *arg)
 307{
 308        if (!MACH_IS_ATARI)
 309                return 0;
 310
 311        if (!strcmp(arg, "ser"))
 312                /* defaults to ser2 for a Falcon and ser1 otherwise */
 313                arg = MACH_IS_FALCON ? "ser2" : "ser1";
 314
 315        if (!strcmp(arg, "ser1")) {
 316                /* ST-MFP Modem1 serial port */
 317                atari_init_mfp_port(B9600|CS8);
 318                atari_console_driver.write = atari_mfp_console_write;
 319        } else if (!strcmp(arg, "ser2")) {
 320                /* SCC Modem2 serial port */
 321                atari_init_scc_port(B9600|CS8);
 322                atari_console_driver.write = atari_scc_console_write;
 323        } else if (!strcmp(arg, "midi")) {
 324                /* MIDI port */
 325                atari_init_midi_port(B9600|CS8);
 326                atari_console_driver.write = atari_midi_console_write;
 327        } else if (!strcmp(arg, "par")) {
 328                /* parallel printer */
 329                atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */
 330                sound_ym.rd_data_reg_sel = 7;   /* select mixer control */
 331                sound_ym.wd_data = 0xff;        /* sound off, ports are output */
 332                sound_ym.rd_data_reg_sel = 15;  /* select port B */
 333                sound_ym.wd_data = 0;           /* no char */
 334                sound_ym.rd_data_reg_sel = 14;  /* select port A */
 335                sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */
 336                atari_console_driver.write = atari_par_console_write;
 337        }
 338        if (atari_console_driver.write)
 339                register_console(&atari_console_driver);
 340
 341        return 0;
 342}
 343
 344early_param("debug", atari_debug_setup);
 345